Have you ever gotten a sunburn through clothing? Not likely. While normal clothing can permit up to 50% UV penetration and recommendations to wear UPF (Ultraviolet Protection Factor) clothing are common, most ordinary clothing fabrics provide adequate protection from the sun.
To illustrate, we dermatologists use the example of the Farmer's Tan: outdoor workers with totally white skin on their front, back and lower body, but sun-damaged skin on the forearms, face and neck.
The terms 'farmer's tan' and 'redneck' originated from this phenomenon. The lesson is that ordinary clothing protects.
Thicker fabrics protect better than thinner fabrics. If you can see light through a fabric, UV can pass through it. Hold clothing and hats up to the light if you are not sure.
An important exception is that when fabrics get wet, they allow more UV to pass through. That's why it is wise for infants, children and surfers/snorkelers of fair skin to wear the special UPF garments that protect in the water. Don't rely on a simple t-shirt.
The makers of UPF garments have good intentions. Sadly, higher pricing limits widespread use of these products.
Have a nice day outdoors! And don't forget: sunscreens are best used in conjunction with avoidance of direct sun on skin exposure!
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